Cyanobacteria (also known as blue-green algae) are common native algae in lakes, ponds and rivers around the world. In Vermont, they can be found in any water body or river. Some species of cyanobacteria produce toxins and these toxins have been documented in some Vermont lakes. Not all algae blooms include cyanobacteria and cyanobacteria aren’t always toxic.

We can all safely swim, fish, and boat in Vermont’s lakes and ponds if we learn to recognize these algae. The information here will help you know when it is best to find another place for your family or pets to enjoy the water.